A novel polyester composite nanofiltration membrane prepared by interfacial polymerization catalysed by 4-dimethylaminopyridine: Enhanced the water permeability and anti-fouling ability

Polymer ◽  
2018 ◽  
Vol 153 ◽  
pp. 24-32 ◽  
Author(s):  
Jun Cheng ◽  
Zhiqiang Zhang ◽  
Wenxin Shi ◽  
Ruijun Zhang ◽  
Bing Zhang ◽  
...  
Keyword(s):  
Water Permeability ◽  
Interfacial Polymerization ◽  
Nanofiltration Membrane ◽  
Polyester Composite

scholarly journals Enhancing H2O2 Tolerance and Separation Performance through the Modification of the Polyamide Layer of a Thin-Film Composite Nanofiltration Membrane by Using Graphene

Membranes ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 592
Author(s):  
Yi-Li Lin ◽  
Nai-Yun Zheng ◽  
Yu-Shen Chen
Keyword(s):  
Thin Film ◽  
Water Permeability ◽  
Interfacial Polymerization ◽  
Membrane Surface ◽  
Separation Performance ◽  
Nanofiltration Membrane ◽  
Permeate Flux ◽  
Film Composite ◽  
Salt Rejection ◽  
Thin Film Composite

Through interfacial polymerization (IP), a polyamide (PA) layer was synthesized on the top of a commercialized polysulfone substrate to form a thin-film composite (TFC) nanofiltration membrane. Graphene oxide (GO) was dosed during the IP process to modify the NF membrane, termed TFC-GO, to enhance oxidant resistance and membrane performance. TFC-GO exhibited increased surface hydrophilicity, water permeability, salt rejection, removal efficiency of pharmaceutical and personal care products (PPCPs), and H2O2 resistance compared with TFC. When H2O2 exposure was 0–96000 ppm-h, the surfaces of the TFC and TFC-GO membranes were damaged, and swelling was observed using scanning electron microscopy. However, the permeate flux of TFC-GO remained stable, with significantly higher NaCl, MgSO4, and PPCP rejection with increasing H2O2 exposure intensity than TFC, which exhibited a 3.5-fold flux increase with an approximate 50% decrease in salt and PPCP rejection. GO incorporated into a PA layer could react with oxidants to mitigate membrane surface damage and increase the negative charge on the membrane surface, resulting in the enhancement of the electrostatic repulsion of negatively charged PPCPs. This hypothesis was confirmed by the significant decrease in PPCP adsorption onto the surface of TFC-GO compared with TFC. Therefore, TFC-GO membranes exhibited superior water permeability, salt rejection, and PPCP rejection and satisfactory resistance to H2O2, indicating its great potential for practical applications.

scholarly journals Two-dimensional fractal nanocrystals templating for substantial performance enhancement of polyamide nanofiltration membrane

2021 ◽  
Vol 118 (37) ◽  
pp. e2019891118
Author(s):  
Yang Lu ◽  
Ruoyu Wang ◽  
Yuzhang Zhu ◽  
Zhenyi Wang ◽  
Wangxi Fang ◽  
...  
Keyword(s):  
Performance Enhancement ◽  
Interfacial Polymerization ◽  
Water Flux ◽  
Practical Method ◽  
Curing Temperature ◽  
Polymerization Process ◽  
Nanofiltration Membrane ◽  
Two Dimensional ◽  
Fractal Structures ◽  
Templating Method

In this study, we report the emergence of two-dimensional (2D) branching fractal structures (BFS) in the nanoconfinement between the active and the support layer of a thin-film-composite polyamide (TFC-PA) nanofiltration membrane. These BFS are crystal dendrites of NaCl formed when salts are either added to the piperazine solution during the interfacial polymerization process or introduced to the nascently formed TFC-PA membrane before drying. The NaCl dosing concentration and the curing temperature have an impact on the size of the BFS but not on the fractal dimension (∼1.76). The BFS can be removed from the TFC-PA membranes by simply dissolving the crystal dendrites in deionized water, and the resulting TFC-PA membranes have substantially higher water fluxes (three- to fourfold) without compromised solute rejection. The flux enhancement is believed to be attributable to the distributed reduction in physical binding between the PA active layer and the support layer, caused by the exertion of crystallization pressure when the BFS formed. This reduced physical binding leads to an increase in the effective area for water transport, which, in turn, results in higher water flux. The BFS-templating method, which includes the interesting characteristics of 2D crystal dendrites, represents a facile, low-cost, and highly practical method of enhancing the performance of the TFC-PA nanofiltration membrane without having to alter the existing infrastructure of membrane fabrication.

scholarly journals Modification of polyamide TFC nanofiltration membrane for improving separation and antifouling properties

RSC Advances ◽  
2018 ◽  
Vol 8 (27) ◽  
pp. 15102-15110 ◽  
Author(s):  
Li-Fen Liu ◽  
Xiang Huang ◽  
Xiao Zhang ◽  
Ke Li ◽  
Yan-Li Ji ◽  
...  
Keyword(s):  
Interfacial Polymerization ◽  
Aromatic Polyamide ◽  
Good Stability ◽  
Nanofiltration Membrane ◽  
Antifouling Property ◽  
Dye Rejection ◽  
Polymerization Method

TMAAM, a new dendrimer, was used to modify the conventional aromatic polyamide NF membrane via interfacial polymerization method, and the result TMAAM-based semi-aromatic polyamide NF membrane strong dye rejection, favourable antifouling property and good stability.

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